package com.gientech.madp.sm2.utils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @Author smile_ZhongXuan
 * @Date 2021/11/1 12:49
 * @Version 1.0
 */
public class SM4Util {

    private static final Pattern p = Pattern.compile("\\s*|\t|\r|\n");

    public SM4Util() {
    }

    public static String encryptDataECB(String secretKey, String plainText) {
        try {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_ENCRYPT;
            byte[] keyBytes;
            keyBytes = secretKey.getBytes();
            SM4 sm4 = new SM4();
            sm4.sm4_setkey_enc(ctx, keyBytes);
            byte[] encrypted = sm4.sm4_crypt_ecb(ctx, plainText.getBytes(StandardCharsets.UTF_8));
            String cipherText = Base64.getEncoder().encodeToString(encrypted);
            if (cipherText != null && cipherText.trim().length() > 0) {
                Matcher m = p.matcher(cipherText);
                cipherText = m.replaceAll("");
            }
            return cipherText;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static String decryptDataECB(String secretKey, String cipherText) throws Exception {
        try {
            SM4_Context ctx = new SM4_Context();
            ctx.isPadding = true;
            ctx.mode = SM4.SM4_DECRYPT;
            byte[] keyBytes;
            keyBytes = secretKey.getBytes();
            SM4 sm4 = new SM4();
            sm4.sm4_setkey_dec(ctx, keyBytes);
            byte[] decrypted = sm4.sm4_crypt_ecb(ctx, Base64.getDecoder().decode(cipherText));
            return new String(decrypted, StandardCharsets.UTF_8);
        } catch (Exception e) {
            throw new Exception("SM4解密失败，请检查解密秘钥或解密类型,解密字段是否配置正确：cipherText: " + cipherText, e);
        }
    }


    static class SM4 {
        public static final int SM4_ENCRYPT = 1;
        public static final int SM4_DECRYPT = 0;

        private int GET_ULONG_BE(byte[] b, int i) {
            int n = (int) (b[i] & 0xff) << 24 | (int) ((b[i + 1] & 0xff) << 16)
                    | (int) ((b[i + 2] & 0xff) << 8) | (int) (b[i + 3] & 0xff) & 0xffffffff;
            return n;
        }

        private void PUT_ULONG_BE(int n, byte[] b, int i) {
            b[i] = (byte) (int) (0xFF & n >> 24);
            b[i + 1] = (byte) (int) (0xFF & n >> 16);
            b[i + 2] = (byte) (int) (0xFF & n >> 8);
            b[i + 3] = (byte) (int) (0xFF & n);
        }

        private int SHL(int x, int n) {
            return (x & 0xFFFFFFFF) << n;
        }

        private int ROTL(int x, int n) {
            return SHL(x, n) | x >> (32 - n);
        }

        public static final byte[] SboxTable = {(byte) 0xd6, (byte) 0x90, (byte) 0xe9, (byte) 0xfe,
                (byte) 0xcc, (byte) 0xe1, 0x3d, (byte) 0xb7, 0x16, (byte) 0xb6, 0x14, (byte) 0xc2, 0x28,
                (byte) 0xfb, 0x2c, 0x05, 0x2b, 0x67, (byte) 0x9a, 0x76, 0x2a, (byte) 0xbe, 0x04, (byte) 0xc3,
                (byte) 0xaa, 0x44, 0x13, 0x26, 0x49, (byte) 0x86, 0x06, (byte) 0x99, (byte) 0x9c, 0x42, 0x50,
                (byte) 0xf4, (byte) 0x91, (byte) 0xef, (byte) 0x98, 0x7a, 0x33, 0x54, 0x0b, 0x43, (byte) 0xed,
                (byte) 0xcf, (byte) 0xac, 0x62, (byte) 0xe4, (byte) 0xb3, 0x1c, (byte) 0xa9, (byte) 0xc9,
                0x08, (byte) 0xe8, (byte) 0x95, (byte) 0x80, (byte) 0xdf, (byte) 0x94, (byte) 0xfa, 0x75,
                (byte) 0x8f, 0x3f, (byte) 0xa6, 0x47, 0x07, (byte) 0xa7, (byte) 0xfc, (byte) 0xf3, 0x73, 0x17,
                (byte) 0xba, (byte) 0x83, 0x59, 0x3c, 0x19, (byte) 0xe6, (byte) 0x85, 0x4f, (byte) 0xa8, 0x68,
                0x6b, (byte) 0x81, (byte) 0xb2, 0x71, 0x64, (byte) 0xda, (byte) 0x8b, (byte) 0xf8,
                (byte) 0xeb, 0x0f, 0x4b, 0x70, 0x56, (byte) 0x9d, 0x35, 0x1e, 0x24, 0x0e, 0x5e, 0x63, 0x58,
                (byte) 0xd1, (byte) 0xa2, 0x25, 0x22, 0x7c, 0x3b, 0x01, 0x21, 0x78, (byte) 0x87, (byte) 0xd4,
                0x00, 0x46, 0x57, (byte) 0x9f, (byte) 0xd3, 0x27, 0x52, 0x4c, 0x36, 0x02, (byte) 0xe7,
                (byte) 0xa0, (byte) 0xc4, (byte) 0xc8, (byte) 0x9e, (byte) 0xea, (byte) 0xbf, (byte) 0x8a,
                (byte) 0xd2, 0x40, (byte) 0xc7, 0x38, (byte) 0xb5, (byte) 0xa3, (byte) 0xf7, (byte) 0xf2,
                (byte) 0xce, (byte) 0xf9, 0x61, 0x15, (byte) 0xa1, (byte) 0xe0, (byte) 0xae, 0x5d,
                (byte) 0xa4, (byte) 0x9b, 0x34, 0x1a, 0x55, (byte) 0xad, (byte) 0x93, 0x32, 0x30, (byte) 0xf5,
                (byte) 0x8c, (byte) 0xb1, (byte) 0xe3, 0x1d, (byte) 0xf6, (byte) 0xe2, 0x2e, (byte) 0x82,
                0x66, (byte) 0xca, 0x60, (byte) 0xc0, 0x29, 0x23, (byte) 0xab, 0x0d, 0x53, 0x4e, 0x6f,
                (byte) 0xd5, (byte) 0xdb, 0x37, 0x45, (byte) 0xde, (byte) 0xfd, (byte) 0x8e, 0x2f, 0x03,
                (byte) 0xff, 0x6a, 0x72, 0x6d, 0x6c, 0x5b, 0x51, (byte) 0x8d, 0x1b, (byte) 0xaf, (byte) 0x92,
                (byte) 0xbb, (byte) 0xdd, (byte) 0xbc, 0x7f, 0x11, (byte) 0xd9, 0x5c, 0x41, 0x1f, 0x10, 0x5a,
                (byte) 0xd8, 0x0a, (byte) 0xc1, 0x31, (byte) 0x88, (byte) 0xa5, (byte) 0xcd, 0x7b,
                (byte) 0xbd, 0x2d, 0x74, (byte) 0xd0, 0x12, (byte) 0xb8, (byte) 0xe5, (byte) 0xb4,
                (byte) 0xb0, (byte) 0x89, 0x69, (byte) 0x97, 0x4a, 0x0c, (byte) 0x96, 0x77, 0x7e, 0x65,
                (byte) 0xb9, (byte) 0xf1, 0x09, (byte) 0xc5, 0x6e, (byte) 0xc6, (byte) 0x84, 0x18,
                (byte) 0xf0, 0x7d, (byte) 0xec, 0x3a, (byte) 0xdc, 0x4d, 0x20, 0x79, (byte) 0xee, 0x5f, 0x3e,
                (byte) 0xd7, (byte) 0xcb, 0x39, 0x48};

        public static final int[] FK = {0xa3b1bac6, 0x56aa3350, 0x677d9197, 0xb27022dc};
        public static final int[] CK = {0x00070e15, 0x1c232a31, 0x383f464d, 0x545b6269, 0x70777e85,
                0x8c939aa1, 0xa8afb6bd, 0xc4cbd2d9, 0xe0e7eef5, 0xfc030a11, 0x181f262d, 0x343b4249,
                0x50575e65, 0x6c737a81, 0x888f969d, 0xa4abb2b9, 0xc0c7ced5, 0xdce3eaf1, 0xf8ff060d,
                0x141b2229, 0x30373e45, 0x4c535a61, 0x686f767d, 0x848b9299, 0xa0a7aeb5, 0xbcc3cad1,
                0xd8dfe6ed, 0xf4fb0209, 0x10171e25, 0x2c333a41, 0x484f565d, 0x646b7279};

        private byte sm4Sbox(byte inch) {
            int i = inch & 0xFF;
            byte retVal = SboxTable[i];
            return retVal;
        }

        private int sm4Lt(int ka) {
            int bb = 0;
            int c = 0;
            byte[] a = new byte[4];
            byte[] b = new byte[4];
            PUT_ULONG_BE(ka, a, 0);
            b[0] = sm4Sbox(a[0]);
            b[1] = sm4Sbox(a[1]);
            b[2] = sm4Sbox(a[2]);
            b[3] = sm4Sbox(a[3]);
            bb = GET_ULONG_BE(b, 0);
            c = bb ^ ROTL(bb, 2) ^ ROTL(bb, 10) ^ ROTL(bb, 18) ^ ROTL(bb, 24);
            return c;
        }

        private int sm4F(int x0, int x1, int x2, int x3, int rk) {
            return x0 ^ sm4Lt(x1 ^ x2 ^ x3 ^ rk);
        }

        private int sm4CalciRK(int ka) {
            int bb = 0;
            int rk = 0;
            byte[] a = new byte[4];
            byte[] b = new byte[4];
            PUT_ULONG_BE(ka, a, 0);
            b[0] = sm4Sbox(a[0]);
            b[1] = sm4Sbox(a[1]);
            b[2] = sm4Sbox(a[2]);
            b[3] = sm4Sbox(a[3]);
            bb = GET_ULONG_BE(b, 0);
            rk = bb ^ ROTL(bb, 13) ^ ROTL(bb, 23);
            return rk;
        }

        private void sm4_setkey(int[] SK, byte[] key) {
            int[] MK = new int[4];
            int[] k = new int[36];
            int i = 0;
            MK[0] = GET_ULONG_BE(key, 0);
            MK[1] = GET_ULONG_BE(key, 4);
            MK[2] = GET_ULONG_BE(key, 8);
            MK[3] = GET_ULONG_BE(key, 12);
            k[0] = MK[0] ^ (int) FK[0];
            k[1] = MK[1] ^ (int) FK[1];
            k[2] = MK[2] ^ (int) FK[2];
            k[3] = MK[3] ^ (int) FK[3];
            for (; i < 32; i++) {
                k[(i + 4)] = (k[i] ^ sm4CalciRK(k[(i + 1)] ^ k[(i + 2)] ^ k[(i + 3)] ^ (int) CK[i]));
                SK[i] = k[(i + 4)];
            }
        }

        private void sm4_one_round(int[] sk, byte[] input, byte[] output) {
            int i = 0;
            int[] ulbuf = new int[36];
            ulbuf[0] = GET_ULONG_BE(input, 0);
            ulbuf[1] = GET_ULONG_BE(input, 4);
            ulbuf[2] = GET_ULONG_BE(input, 8);
            ulbuf[3] = GET_ULONG_BE(input, 12);
            while (i < 32) {
                ulbuf[(i + 4)] = sm4F(ulbuf[i], ulbuf[(i + 1)], ulbuf[(i + 2)], ulbuf[(i + 3)], sk[i]);
                i++;
            }
            PUT_ULONG_BE(ulbuf[35], output, 0);
            PUT_ULONG_BE(ulbuf[34], output, 4);
            PUT_ULONG_BE(ulbuf[33], output, 8);
            PUT_ULONG_BE(ulbuf[32], output, 12);
        }

        private byte[] padding(byte[] input, int mode) {
            if (input == null) {
                return null;
            }
            byte[] ret = (byte[]) null;
            if (mode == SM4_ENCRYPT) {
                int p = 16 - input.length % 16;
                ret = new byte[input.length + p];
                System.arraycopy(input, 0, ret, 0, input.length);
                for (int i = 0; i < p; i++) {
                    ret[input.length + i] = (byte) p;
                }
            } else {
                int p = input[input.length - 1];
                ret = new byte[input.length - p];
                System.arraycopy(input, 0, ret, 0, input.length - p);
            }
            return ret;
        }

        public void sm4_setkey_enc(SM4_Context ctx, byte[] key) throws Exception {
            if (ctx == null) {
                throw new Exception("ctx is null!");
            }
            if (key == null || key.length != 16) {
                throw new Exception("key error!秘钥长度请设为16位!");
            }
            ctx.mode = SM4_ENCRYPT;
            sm4_setkey(ctx.sk, key);
        }

        public byte[] sm4_crypt_ecb(SM4_Context ctx, byte[] input) throws Exception {
            if (input == null) {
                throw new Exception("input is null!");
            }
            if ((ctx.isPadding) && (ctx.mode == SM4_ENCRYPT)) {
                input = padding(input, SM4_ENCRYPT);
            }
            int length = input.length;
            ByteArrayInputStream bins = new ByteArrayInputStream(input);
            ByteArrayOutputStream bous = new ByteArrayOutputStream();
            for (; length > 0; length -= 16) {
                byte[] in = new byte[16];
                byte[] out = new byte[16];
                bins.read(in);
                sm4_one_round(ctx.sk, in, out);
                bous.write(out);
            }
            byte[] output = bous.toByteArray();
            if (ctx.isPadding && ctx.mode == SM4_DECRYPT) {
                output = padding(output, SM4_DECRYPT);
            }
            bins.close();
            bous.close();
            return output;
        }

        public void sm4_setkey_dec(SM4_Context ctx, byte[] key) throws Exception {
            if (ctx == null) {
                throw new Exception("ctx is null!");
            }
            if (key == null || key.length != 16) {
                throw new Exception("key error!");
            }
            int i = 0;
            ctx.mode = SM4_DECRYPT;
            sm4_setkey(ctx.sk, key);
            for (i = 0; i < 16; i++) {
                SWAP(ctx.sk, i);
            }
        }

        private void SWAP(int[] sk, int i) {
            int t = sk[i];
            sk[i] = sk[(31 - i)];
            sk[(31 - i)] = t;
        }

        public byte[] sm4_crypt_cbc(SM4_Context ctx, byte[] iv, byte[] input) throws Exception {
            if (iv == null || iv.length != 16) {
                throw new Exception("iv error!");
            }
            if (input == null) {
                throw new Exception("input is null!");
            }
            if (ctx.isPadding && ctx.mode == SM4_ENCRYPT) {
                input = padding(input, SM4_ENCRYPT);
            }
            int i = 0;
            int length = input.length;
            ByteArrayInputStream bins = new ByteArrayInputStream(input);
            ByteArrayOutputStream bous = new ByteArrayOutputStream();
            if (ctx.mode == SM4_ENCRYPT) {
                for (; length > 0; length -= 16) {
                    byte[] in = new byte[16];
                    byte[] out = new byte[16];
                    byte[] out1 = new byte[16];

                    bins.read(in);
                    for (i = 0; i < 16; i++) {
                        out[i] = ((byte) (in[i] ^ iv[i]));
                    }
                    sm4_one_round(ctx.sk, out, out1);
                    System.arraycopy(out1, 0, iv, 0, 16);
                    bous.write(out1);
                }
            } else {
                byte[] temp = new byte[16];
                for (; length > 0; length -= 16) {
                    byte[] in = new byte[16];
                    byte[] out = new byte[16];
                    byte[] out1 = new byte[16];
                    bins.read(in);
                    System.arraycopy(in, 0, temp, 0, 16);
                    sm4_one_round(ctx.sk, in, out);
                    for (i = 0; i < 16; i++) {
                        out1[i] = ((byte) (out[i] ^ iv[i]));
                    }
                    System.arraycopy(temp, 0, iv, 0, 16);
                    bous.write(out1);
                }
            }
            byte[] output = bous.toByteArray();
            if (ctx.isPadding && ctx.mode == SM4_DECRYPT) {
                output = padding(output, SM4_DECRYPT);
            }
            bins.close();
            bous.close();
            return output;
        }
    }

    static class SM4_Context {
        public int mode;
        public int[] sk;
        public boolean isPadding;

        public SM4_Context() {
            this.mode = 1;
            this.isPadding = true;
            this.sk = new int[32];
        }
    }

    public static void main(String[] args) throws Exception {
        String security = "11HDESaAhiHHugDz";
        String enString = "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";
        String decryptEcb = SM4Util.decryptDataECB(security, enString);
        System.out.println(decryptEcb);
    }
}

